Appearance of Three Dimensionality in Wall-Bounded MHD Flows
Appearance of Three Dimensionality in Wall-Bounded MHD Flows
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DOI：
10.1103/physrevlett.104.034502
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发表时间：
2010-01-22
影响因子：
8.6
通讯作者：
Potherat, A.
中科院分区：
文献类型：
--
作者：
Klein, R.;Potherat, A.
我们的实验特征如何出现在壁有界磁流体动力学流动的三维。我们的分析崩溃的正方形阵列的漩涡在一个立方体容器挑出两个机制：第一，一种形式的三维，我们称之为弱出现通过差分旋转在个别的二维漩涡。第二，强大的三维特征的涡破裂导致一方面一个显着的涡阵列，这是稳定的和3D的，另一方面，在混沌流的二维尺度选择性故障。最重要的是，这些现象完全由惯性驱动，因此它们与其他具有二维倾向的流动有关，例如地球物理学和天体物理学中的旋转流或分层流。
We characterize experimentally how three dimensionality appears in wall-bounded magnetohydrodynamic flows. Our analysis of the breakdown of a square array of vortices in a cubic container singles out two mechanisms: first, a form of three dimensionality we call weak appears through differential rotation in individual 2D vortices. Second, strong three dimensionality characterized by vortex disruption leads on the one hand to a remarkable vortex array that is both steady and 3D, and, on the other hand, to scale-selective breakdown of two dimensionality in chaotic flows. Most importantly, these phenomena are entirely driven by inertia, so they are relevant to other flows with a tendency to two dimensionality, such as rotating, or stratified flows in geophysics and astrophysics.